If Jesus existed, he was insane. But he didn't exist. In the case of a man who was supposedly performing miracles left and right, including resurrecting the dead, absence of evidence is evidence of absence.
Even Richard Dawkins believes that Jesus existed. I realize that doesn't prove anything but he is a very skeptical man, obviously:
Also, do you think a madman would say these words?
Matthew 22:39 'Love your neighbor as yourself
Matthew 5:41 And if anyone forces you to go one mile, go with him two miles.
Matthew 5:42 Give to the one who asks you, and do not turn away from the one who wants to borrow from you.
Luke 6:35 But love your enemies, do good to them, and lend to them without expecting to get anything back. Then your reward will be great, and you will be sons of the Most High, because he is kind to the ungrateful and wicked.
Luke 6:28 bless those who curse you, pray for those who mistreat you.
Luke 14:12-14 Then Jesus said to his host, “When you give a luncheon or dinner, do not invite your friends, your brothers or relatives, or your rich neighbors; if you do, they may invite you back and so you will be repaid. But when you give a banquet, invite the poor, the crippled, the lame, the blind, and you will be blessed.
As far as the resurrection, there is evidence. Here is a good video that presents the general case for the resurrection: